Tractor driving mechanism



A. H. BAIRD.

TRACTOR DRIVING MECHANISM.

APPLICATION man APR. 18. 19w.

3 SHEETa--SHEU' h Patented Feb. 10,1920.

HIIIIIIIIHH llln.

A. H. BAIRD.

TRACTOR DRIVING MECHANISM.

APPLICATION FILED APR. 18, 19x9.

1,830,298. Patented Feb. 10,1920.

3 SHEETSSHEET 2- A. H. BAIRD.

TRACTOR DRIVING MECHANISM.

APPLICATION FILED APR-18.1919.

nurrn s'rarns rn rnrir OFFICE.

ALBERT H. BAIBD, or PDRTHURSN,MISHIGA1\T, assreivon reruns nunennusnvn &

THRESHEB COMPANY, OF PORT HURGN, MICHIGAN,

To'aZZ whom it may concern 7 Be it known thatl, ALBERT I'l. BAIRD, a 011312811 of the United States, and

a Port Huron, in the county of St. Clair and wheel and either disk 'residient. connection :the friction wheel and the engine which will State of Michigan, have invented a new and Improved'Tractor Driving Mechanism, of which the following is a specification.

This'invention relates to motor vehicles whose driving mechanism embodies a friction wheel connected directly to the engine and'a pair of friction disks either of which may :be-carried to. engagethe friction wheel through the action of a reverse lever, and

the object is to provide improved means for controlling the pressure between the friction and to provide a novel between the shaft for reduce the tendency of this shaft to break.

' struction of quadrant for the trol lever of the 4 mg mechanisni'o'f motor vehicles comprising tional elements. flexible coupling 1 engine for 1 connections on a larger scale. -'v1ewofa drlving shaft.

This inventionconsists-in a novel conpressure-confriction gearing of the drivnormal stops. for the lever so as to cause a predetermined pressure between the fricmeinbers, sufficient to drive the vehicle after it has started, and auxiliary stops for the lever which permit extraordinary pressures between the frictional members for the purpose vehicle. It further consists in mounting a spring between the control lever and-the connecting rod extending therefrom to the frictional devices, which spring will transmit the stresses from the lever to the connecting rod. an indicator termining the stresses between the frictional between the shaft 'for'the friction wheelland the main shaft of the the purpose of reducing the tendency of this friction-wheel shaft and its companying drawings and particularly pointed'out in'the claimsj 4 In the accompanying drawings, Figure 1 is a'plan of the rear portion of a tractor. line 22 of Fig. 1

Fig.2 is a section'on. the

' Fig. 3 ma perspectwe Figis a rearelevation :of -a fly-wheel. .Fig. 15 is a longitudinal-section of tbe flyewheelaudelevat n "Specification of Letters latent.

Application filed April is,

residing at tractor wheels of starting the It also consists in connecting V to the control lever and the rod extending therefrom for the purpose ofde'-' gears 11 whichare It also consists in providing a to break. It also consists .in the .14

details of construction illustrated in the accarries pins,23 whih -are" ends, of. the forkedshortarm 24 f A GOBPORATION OF MIGHIGA'N,

reactor. DRIVING rancnamsivr.

Patented Feb. 10 ,'-19 20. 19 seia i friction wheel on its shaft. Fig. 7 is ,anelelever. Fig.- 8 is an elevationgof the pressure ind cator. Fig. 9 is a section on the line 9 9 of Fig. 8. Fig. 10 isa perspective view of an ad ustable stop .1

" Similar reference charactersre'fer to like p arts throughout the several views.

' of a friction wheel. "Fig. 6 isanielevation of the speed-.controllever for. positioning the ration of the quadrant {for the reversing Great trouble has been experienced in friction driven tractors because of the main drive shaft which carries the friction wheel getting out of alinement because of the pressure thereonand because .ofrthe twisting of the frame of the tractor when passing over rough roads, resulting in broken shafts or connections between them and the 'enhave arisen out ofthe gines. Other troubles lied to the 'fricunnecessary pressures app tional driving elements because experience of the operators and because'of of lack of lack .ofQineans to .determinesuch pressures- J The present construction overcomes these difficulties and enables even unskilled workinen to apply the proper pressureto the frictional drivlng members.

In Fig. 1 the driving-mechanisnrforgthe whichigear 9 is driven byaplnion .(notshown) on th shaft 4. This shaft is, ddriven byathe pinion? engaging the gear 3 and 1 the shaft 1 and'its two I friction 1 disks means of a: bell-crank inountedQI the pm 16 carried by a cross bar 17 This shaft ,1 is .mounted in 18,

as shown inllig. 2', andon it lare two Qthrust collar :22 [surrounds the' h I crankla zA tl eQ IIMl YQI Q. .1 bell-seek si ee a srvata 1r s cs9 securedithereto are movable endwise stresses caused by the twisting of the chassis and also caused by undue pressures received from the disks14.

The friction wheel is slidable on this shaft, in order to change the speed of the vehicle, by means of a lever 35, shown in Fig; 6, mounted on a pin 36 at the center of a quadrant 37, the quadrant being pref.- erably mounted at therear endof the tractor. A connecting rod 38 extends forward from this lever to the friction disk 25 whereit is forked, its ends connecting to a collar 39 which rides in the groove 40 in the hub 41 of the friction wheel. See Fig. 5. By moving this friction wheel in and out from theshaft 1, the speed of the vehicle for constant revolutions of the engine is determined.

Adjacentthe quadrant 37 is a second quadrant 43, at the center of which 1s the pin 36011 which the reverse lever '45 is also Qmounted. The quadrant has aneutral notch the dog 52 on the 46 and two cadjustable stops 47 and 48, each secured in position by a screw 49. The shoulders 50 on these stops are inclined toward the center of the quadrant so that lever may ride up and without being manually lifted. As shownin Fig. 6, this dog is at the end of a link 53 and is normally held down by a spring 54, but may be raised by a lifter 55. This mechanism is also employed on the lever 45.

over the shoulders the arm 15 of the bell-crank which moves .the friction disks is a connecting rod 57,

whose rear end is shown in Fig. 8. This end is slidable in a case 58 and connected to The sleeves 59 and 60 are freely 'slidable Within'the case, p with a hole toreceive the bolt 66 that extends through ahole;67' (Fig. 7 in the reverselever 45.; V p

' .When the reverse lever 1s moved forward 1 to the right in Fig. 8, the case will push the rear washer '63 forward against the spring 64, compressing 1t and causing 1t to press against the washer 62 and this washer f against thesleeve '59 which is rigid with the rod 57. On the case'is a graduated dial 69 and on this dial; is pivoted a pointer 70 Extending rearwardly from the end of which has a lug provided nected at one whose lower end connects to a link 72 connected to a pin 73 on the connecting rod 57. The pressure on the spring and its compression, and the pressure on the rod 57 and between the friction disks and friction wheel 25 will therefore always be indicated by this pointer 70. v

The desired pressure between the friction wheel 25 and the disks 14 having been determined the lei er 45 is pulled back. until the pointer indicates this pressure, whereupon the stop 48 is locked with its shoulder 50 against the dog 52 on the lever 45. The stop 47 is then adjusted in a similar manner. When the vehicle is to be started the pressure between the frictional members should usually be somewhat greater than that necessarv for regular running; The

screws 75, carried by. these stops may be adjusted to permit the lever tobe pulled a sufficient distance farther from the neutral notch 46 to give this increased pressure.

l/Vhen the vehicle is to bestarted, the lever 45 is placed central with its dog 52 in the notch 46, and the engine is started. The

friction wheel 25 is then preferably-movedforwardly as far aspossible by the lever 35 so that the engine may have as much leverage as possible. The lever 45 is then pulled back (to the left inFig. 7), the dog 52 rid-j ing up and over the shoulder 50 of the stop 48, until this dog strikes the-adjusting screw 75, at which time the greatest permissible pressure is exerted by the left-hand disk 14 on the friction wheel 25. After the vehicle has started, the lever 45 is released whereupon the spring 64will move it forward until the dog 52 engages the shoulder '50. of this rear stop 48, at which point the proper pressure between the frictional members will be had.

It will thus be seenthat thedriver need only release his dog 52 from the central notch 46 and pull back the lever until it stops in order to cause startingpressure between the frictional members, and then to merely let go of this lever in order to obtain running pressure. The operation is the same when the vehicle is to run backward,

excepting that the reverse lever 45 ispushed forward.

' The details of construction and the proportions of the parts may all be changed by automotive engineers without departing from the spirit of my invention as set forth .in the following claims.

1. In a friction drive, the combination of a pair of alined disks and a wheel between them, means to move the disks axially in either direction embodying a bell-crank lever connected to said disks and a rod .conend to said bell crank, a compression s of therod, a case whereln sald sprlngls 1npring mounted on theopposite end.

closed, and a lever connected to said case whereby the disks may be moved in either direction through the instrumentality of said spring and rod. I v

2. In a reversible friction drive, the combination of a pair of frictionally driven disks and a driving Wheel between them, a

lever, adjustable stops to limit the movement of the lever, a spring and means for transmitting stresses from said lever to the spring when the lever is moved in either direction, and means for transmitting stresses from said spring to cause pressure between the driving wheel and one or the other disk as the lever is moved in one direction or the other.

3. In a reversible friction drive, the combination of a pair of frictionally driven disks and a driving wheel between them, a lever, a spring and means for transmitting stresses from said lever to the spring when the lever is moved in either direction, means for transmitting stresses from said spring to cause pressure between the driving wheel and one or the other disk as the lever is moved in one direction or the other, and means for indicating the stresses on said spring.

4. In a reversible friction drive, the combination of a pair of frictionally disks and a driving wheel between them, a lever, a spring and means for stresses from said lever to the spring when the lever is moved in either direction, means for transmitting stresses from said spring to cause pressure between the driving wheel and one or the other disk as the lever is moved in one direction or the other, and a plurality of adjustable stops at each end of the travel of said lever to predetermine maximum and minimum pressures between said driving members. g

5. In a reversible friction drive, the combination of a pair of connected friction disks and a driving wheel between them, means to move the wheel axially of the disks, a bell-crank pivoted adjacent said disks and adapted to move one'or the other into engagement with said wheel, a reverse lever and a spring case connected to the stops, each provided with a spring case pivoted driven transmitting lever, a compression spring within the case means connecting one end of the connecting rod to said bell-crank.

6,. In a reversible frlction drive, the combination of a quadrant having adjustable der and a stop screw,

center of the quadrant and having a dog an inclined shoul a lever pivoted atthe' adapted to-engage said shoulders and screws,

to the lever, a connecting rod extending from the case to the frictional driving elements of a motor ve-. hicle, a spring on and means whereby the lever will compress the spring to move the rod when the lever is moved in either direction.

7 The combination of a one end, a quadrant and means to hold the lever pivoted at the rod within the case, V I

lever at desired positions relative to the quadrant, a case connected to said lever, a compresslon coil spring wlthm the case, a

rod slidable in the case and extending through the spring, the rod at each end of'the spring by means of which the spring may be compressed in- 8. The combination of a lever pivoted at one end, a quadrant and means to hold the lever at desired positions relative tothe quadrant, compression coil spring within the case, a rod slidable in the case and extending through the the red at each end of the spring by means of which the spring may be compressed in eluding disks within the case of larger diameter than the openings for said rod, a

and means secured to s'o'f cluding disks within the caseof' larger dl': ameter than the openings for said rod.

a case connected to said lever, a

spring, and means secured to dial on the case, an indicator pivoted on the case to swing over the dial, and a connector between the rod and indicator gitudinal movement of the rod 111 the case Wlll cause the indicator to move over the dial. 7

ALBERT H. BAIRD.

whereby lon- 

